Defender Jordi Alba says the “feelings” in the Barcelona squad are better than in their treble-winning 2014-15 season.
Barca are unbeaten in La Liga this season and nine points clear at the top of the table.
They are also in the Copa del Rey final and face Roma in the Champions League quarter-final first leg at the Nou Camp on Wednesday as they aim to win all three major trophies again.
“In these moments I have even better feelings,” Alba said.
“This year we could repeat those achievements because not only are we on a good path, but in the three competitions we are performing consistently and at a great level.”
Barcelona beat Athletic Bilbao 3-1 in the 2014-15 Copa del Rey final and beat Juventus 3-1 the following month to win the Champions League.
They became the first European team to twice win the domestic double and the Champions League in the same season, after achieving the feat in 2008-09.
“In the dressing room we aren’t talking about the treble, but we know for our fans it is a great hope, and for us too, but there is a long way to go,” said left-back Alba.
“We know that we have a great squad and if we are at our usual level we can beat anyone, but this is Roma, who finished first in their group with Atletico Madrid and Chelsea in.
“I’m sure they will give us trouble and we have to play with our fans behind us, which I’m sure will help us.”
Roma are third in Serie A, having drawn 1-1 at mid-table Bologna on Saturday.
Manager Eusebio di Francesco said: “We know that if we play like that against Barcelona, it won’t be enough.
“But we also know that Barca will attack. It will be a totally different match.”